The steering vector structures in (REF ) and (REF ) suggest that radar receivers in OTFS suffer from both ISI and ICI effects [1]}, similar to the case of OTFS communications [2]}. However, unlike OTFS communications, these two effects can be turned into an advantage for OTFS radar. In particular, ISI manifests itself through the slow-frequency steering vector \( \mathbf {b} _{M}(\tau )\)  and enables sampling the available bandwidth \(N  \Delta f \)  at integer multiples of \( \Delta f / M\)  as observed from the Kronecker structure in (REF ). In ISI-free operation, the steering vector in (REF ) would only involve the fast-frequency component \( \mathbf {b} _{N}(\tau )\) , which can sample the bandwidth with a spacing of \( \Delta f \) , i.e., the subcarrier spacing. Hence, ISI can increase the maximum detectable unambiguous delay by a factor of \(M\)  by sampling the frequency domain \(M\)  times faster compared to a standard ISI-free radar operation (e.g., in OFDM-based OTFS radarContrary to single-CP OTFS, OFDM-based OTFS systems use separate CPs for each symbol in the OTFS/OFDM frame to circumvent the ISI effect [3]}, [4]}.). More precisely, the unambiguous delays with and without ISI are given, respectively, by
\( \tau ^{\rm {ISI}}_{\rm {max}} = \min \Bigg \lbrace  \frac{M}{ \Delta f },  T_{\rm {cp}} \Bigg \rbrace , ~  \tau _{\rm {max}} = \min \Bigg \lbrace  \frac{1}{ \Delta f },  T_{\rm {cp}} \Bigg \rbrace  ~,\) 
